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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
mined, nor has the maximum number of eggs laid per day, but as 
several eggs seems the normal rate per day during a prolonged period, 
it seems reasonable to calculate that the average female Anastrepha 
fraterculus is capable of depositing between 500 and 800 eggs during 
her lifetime. 
Host Fruits of A. fraterculus 
The eggs are deposited in, and the resulting larvae more or less 
completely destroy the following fruits, according to a recent list pub¬ 
lished by the United States Federal Horticultural Board.: 1 
Guava ( Psidium guajava), coffee berries, pear, peach, mango, orange, 
Eugenia spp. Phylocalyx, Japanese plum, Japanese persimmon, Para 
plum, ( Spondias spp?) Anona humboldtiana, jobo amarillo, jobo de la 
India. 
To the foregoing can be added the following fruits which the writer 
knows to be infested in Northern Argentina: strawberry guava ( Psi¬ 
dium [ Campomanesia ] cattleyanum) , Chinese guava ( Psidium [Cam- 
pomanesia ] lucidium), fig ( Ficus carica), pomelo ( Citrus decumana), 
kumquat (Citrus japoniea), tangerine (Citrus nobilis) , apricot (Prunus 
armeniaca), avocado (Persea americana), chirimoya (Anona cherimola). 
In addition it may be stated that the fruits of Feijoa selowiana have 
been reported as infested at times, and that in several instances the 
writer has found lemons (Citrus medica limonum) which showed evi¬ 
dence of having been “stung ’ 1 by the fly, although no larvae have so 
far been found in the last named fruit. 
Methods of Attack in Different Types of Fruit 
In the region under discussion the first fruits to be attacked in the 
spring are probably the apricots, which are soon followed by peaches, 
and it is the latter fruit which may be regarded as the principal sum¬ 
mer host of the insect. Adult females which have successfully passed 
the colder months or which have emerged from over-wintering larvae 
or pupae, become active early in spring and place eggs in early apricots 
where the larvae develop at a comparatively rapid rate. These larvae 
give rise to a large number of flies which are ready and waiting for the 
early peaches, and in the haste to deposit eggs some fruits are “stung” 
while yet not much more than half-grown, but in these the larvae are 
not able to develop. Such peaches may drop or may cling to the tree, 
but in any case they “mummify” and do not become soft with rot, 
which latter condition seems to be more or less essential to the success- 
1 A Manual of Dangerous Insects Likely to be Introduced in the United States 
Through Importations. Edited by W. Dwight Pierce. Washington, D. C., Aug. 
15, 1917. 
